/Engine/Source/Runtime/RenderCore/Public/RenderGraphBuilder.h
Sets the expected workload of the pass execution lambda. The default workload is 1 and is more or less the 'average cost' of a pass. Recommended usage is to set a workload equal to the number of complex draw / dispatch calls (each with its own parameters, etc), and only as a performance tweak if a particular pass is very expensive relative to other passes.
void SetPassWorkload ( [FRDGPass](API\Runtime\RenderCore\FRDGPass) * Pass, uint32 Workload )